After all these years, I've found the answer to the original question of this dead thread.
Title: Oku no Hosomichi 31 (奥の細道 31)
Ninpu to Shussan to Chitsunai Eizo (妊婦と出産と膣内映像; Pregnant woman, childbirth and intravaginal images)
Tag in the back 1: Ninpu Sex (妊婦SEX; Pregnant Woman Sex)
Tag in the back 2: Joji Shussan (女児出産; Giving birth to a girl)
Label: Cattleya
Catalog no: SE-31
Director: M. Osaka
Actress: Tsubasa (25 years old)
Runtime: 60 minutes
You'll probably not find it easily because it was released through Cattleya, which appears to have been a very small label that worked on order by mail VHS and was active during the early 2000s. The whole Oku no Hosomichi series is focused on pregnant woman and there were 35 releases, AFAIK. And, apparently, this wasn't the only one with birthing scenes. Hopefully, this info helps someone find the whole video and, perhaps, the rest of the series.